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Commitments and Contingencies (Details)
 12 Months Ended
Mar. 31, 2017
USD ($)
ft²
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Remaining future minimum rental payments under operating leases [Abstract]      
2018 $ 3,918,000    
2019 3,496,000    
2020 3,230,000    
2021 3,300,000    
2022 3,200,000    
Thereafter 23,687,000    
Total minimum lease payments 40,831,000    
Total operating lease expenses $ 3,495,000 $ 3,263,000 $ 3,030,000
Commitments to Provide Marketing Allowances under Long-Term Customer Contracts [Abstract]      
Term of long-term agreements with major customer 4 years    
Breakout of allowances recorded as reduction to revenues [Abstract]      
Allowances incurred under long-term customer contracts $ 23,684,000 29,845,000 18,358,000
Allowances related to a single exchange of product 67,262,000 47,451,000 36,112,000
Allowances related to core inventory purchase obligations 5,470,000 2,268,000 15,540,000
Total customer allowances recorded as a reduction of revenues 96,416,000 $ 79,564,000 $ 70,010,000
Marketing Allowances and Customer Remanufactured Core Purchase Obligation [Abstract]      
2018 19,965,000    
2019 8,729,000    
2020 5,224,000    
2021 5,224,000    
2022 113,000    
Total marketing allowances $ 39,255,000    
New Distribution Center in Mexico [Member]      
Operating Lease Commitments [Abstract]      
Operating lease term 15 years    
Area of distribution center in Tijuana, Mexico | ft² 410,000